Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f827ff0278f49…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 17:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb4b40161d80499af74b7e0211ccb418 SHA-1: 36db4db1dba8a6b8bf6d5f56302160039965d4a5 SHA-256: 8c5f827ff0278f496788850d8f9e563f71431fc34788bd5e7185cf250385108d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to compromised websites, specifically leveraging WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3fee2d238---beresupugonenugaz.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/894fd76b625adec582b2fcde3204e488/15274363748.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/17336105103.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/pobaxivudodewoxesotu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d8a7ee27---mogawizipuw.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/tuselamakor.pdfIn PDF document text
    • http://coumert.com/images/file/xodojudafex.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26766e1e6---togezumekobefivufi.pdfIn PDF document text
    • https://arerp.kr/data/file///rudowojutizuga.pdfIn PDF document text
    • https://susta.vn/userfiles/file/nejobulejeredimiriget.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c68c24381---pisezazilogunejonukufov.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/jusawevanubopuziwojuna.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b152e3acc---gotozibedobil.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82a77cebe89ee615302c911337a91209/15058379288.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/devorux.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf83ea3e0---puxejepuvuferitiru.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/23794319647.pdfIn PDF document text
    • http://ahchala.com/img/file/92959478933.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/4756740560.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fe749ef43ea3c541a1bed72bc5f1c7a3/19728343330.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a214cd96---24984506885.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f8ti8nko0s7u2164asnidpj5s3/74233103608.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/16518704822.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/f073hq0ucsg3al65n1sp7csj2c/xuribowixida.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f6ron3pcg8q8ojr24o9j8ieqt8/54090880679.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3eb01c32---viligafogar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bike+race+apk+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10404 bytes
SHA-256: 3e029e2f9fcecc7938eb742c95faed7a50644285e3351befc955d3b57e99972f
font_02_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_03_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 17588 bytes
SHA-256: b0d69ff4009c89f71ec4344e4ad15ea45d7db302b0bee9f7a30070a580220c8c

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